diff --git a/backend/api/base/modal.py b/backend/api/base/modal.py
index 44aeff8b..0c0e09a4 100644
--- a/backend/api/base/modal.py
+++ b/backend/api/base/modal.py
@@ -153,11 +153,12 @@ def open_modal(request: WebRequest, modal_name, context_type=None, context_value
 
         if modal_name == "edit_team_member_permissions":
             team = request.user.logged_in_as_team
-            for_user = team.members.filter(id=context_value).first()
-            for_user_perms = team.permissions.filter(user=for_user).first()
-            if for_user:
-                context["editing_user"] = for_user
-                context["user_current_scopes"] = for_user_perms.scopes if for_user_perms else []
+            if team:
+                for_user = team.members.filter(id=context_value).first()
+                for_user_perms = team.permissions.filter(user=for_user).first()
+                if for_user:
+                    context["editing_user"] = for_user
+                    context["user_current_scopes"] = for_user_perms.scopes if for_user_perms else []
 
         return render(request, template_name, context)
     except ValueError as e:
diff --git a/backend/api/invoices/schedule.py b/backend/api/invoices/schedule.py
index 80ff3bbb..3643348a 100644
--- a/backend/api/invoices/schedule.py
+++ b/backend/api/invoices/schedule.py
@@ -80,8 +80,7 @@ def create_ots(request: HtmxHttpRequest) -> HttpResponse:
             invoice=invoice,
             option=1,
             datetime=request.POST.get("date_time"),
-            email_type=request.POST.get("email_type"),
-            # type: ignore[arg-type]
+            email_type=request.POST.get("email_type"),  # type: ignore[arg-type]
         )
     )
 
diff --git a/backend/api/teams/edit_permissions.py b/backend/api/teams/edit_permissions.py
index ed482b06..d7cf2e84 100644
--- a/backend/api/teams/edit_permissions.py
+++ b/backend/api/teams/edit_permissions.py
@@ -21,9 +21,12 @@ def edit_user_permissions_endpoint(request: WebRequest) -> HttpResponse:
     permissions: list = get_permissions_from_request(request)
     user_id = request.POST.get("user_id")
 
-    receiver = User.objects.filter(id=user_id).first()
+    receiver: User | None = User.objects.filter(id=user_id).first()
 
-    error = edit_member_permissions(request, request.user, receiver, request.user.logged_in_as_team, permissions)
+    if receiver:
+        error = edit_member_permissions(request, request.user, receiver, request.user.logged_in_as_team, permissions)
+    else:
+        error = "Something went wrong"
 
     if error:
         messages.error(request, error)
diff --git a/backend/api/teams/switch_team.py b/backend/api/teams/switch_team.py
index 446022f2..c3b94dad 100644
--- a/backend/api/teams/switch_team.py
+++ b/backend/api/teams/switch_team.py
@@ -1,5 +1,4 @@
 from django.contrib import messages
-from django.contrib.auth.models import AnonymousUser
 from django.http import HttpResponse
 from django.shortcuts import render
 
@@ -7,8 +6,7 @@
 from backend.types.htmx import HtmxHttpRequest
 
 
-def switch_team(request: HtmxHttpRequest, team_id=None):
-    team_id: str | int | None
+def switch_team(request: HtmxHttpRequest, team_id: str | int | None = None):
 
     if not team_id:
         team_id = request.POST.get("join_team", None)
diff --git a/backend/service/defaults/get.py b/backend/service/defaults/get.py
index e1d1ed58..fe51bb7a 100644
--- a/backend/service/defaults/get.py
+++ b/backend/service/defaults/get.py
@@ -4,8 +4,8 @@
 
 def get_account_defaults(request: WebRequest, client: Client | None = None) -> DefaultValues:
     if not client:
-        account_defaults: DefaultValues
+        account_defaults: DefaultValues | None
         if not (account_defaults := DefaultValues.filter_by_owner(owner=request.actor).filter(client__isnull=True).first()):
-            account_defaults = DefaultValues.objects.create(owner=request.actor, client=None)
+            account_defaults = DefaultValues.objects.create(owner=request.actor, client=None)  # type: ignore[misc]
         return account_defaults
     return DefaultValues.filter_by_owner(owner=request.actor).get(client=client)
diff --git a/backend/service/teams/permissions.py b/backend/service/teams/permissions.py
index ff0d4bd7..14e5acbd 100644
--- a/backend/service/teams/permissions.py
+++ b/backend/service/teams/permissions.py
@@ -10,12 +10,11 @@ def edit_member_permissions(request, actor: User | Organization, receiver: User,
     if not validate_scopes(permissions):
         return "Invalid permissions"
 
-    user_team_perms = team.permissions.filter(user=receiver).first()
+    user_team_perms: TeamMemberPermission | None = team.permissions.filter(user=receiver).first()
 
     if not user_team_perms:
         team.permissions.add(TeamMemberPermission.objects.create(user=receiver, team=team, scopes=permissions))
     else:
-        user_team_perms: TeamMemberPermission
         user_team_perms.scopes = permissions
         user_team_perms.save()